layout/style/GenerateCSSPropsGenerated.py

   1 # This Source Code Form is subject to the terms of the Mozilla Public
   2 # License, v. 2.0. If a copy of the MPL was not distributed with this file,
   3 # You can obtain one at http://mozilla.org/MPL/2.0/.
   4
   5 import runpy
   6 import sys
   7 import string
   8 import argparse
   9
  10
  11 class PropertyWrapper(object):
  12     __slots__ = ["index", "prop", "idlname"]
  13
  14     def __init__(self, index, prop):
  15         self.index = index
  16         self.prop = prop
  17         if "Internal" in prop.flags:
  18             self.idlname = None
  19         else:
  20             idl_name = prop.method
  21             if not idl_name.startswith("Moz"):
  22                 idl_name = idl_name[0].lower() + idl_name[1:]
  23             self.idlname = idl_name
  24
  25     def __getattr__(self, name):
  26         return getattr(self.prop, name)
  27
  28
  29 def generate(output, dataFile):
  30     output.write(
  31         """/* THIS IS AN AUTOGENERATED FILE.  DO NOT EDIT */
  32
  33 /* processed file that defines CSS property tables that can't be generated
  34    with the pre-processor, designed to be #included in nsCSSProps.cpp */
  35
  36 """
  37     )
  38
  39     raw_properties = runpy.run_path(dataFile)["data"]
  40     properties = [
  41         PropertyWrapper(i, p)
  42         for i, p in enumerate(raw_properties.values())
  43         if p.type() != "alias"
  44     ]
  45
  46     # Generate kIDLNameTable
  47     output.write(
  48         "const char* const nsCSSProps::" "kIDLNameTable[eCSSProperty_COUNT] = {\n"
  49     )
  50     for p in properties:
  51         if p.idlname is None:
  52             output.write("  nullptr,  // {}\n".format(p.name))
  53         else:
  54             output.write('  "{}",\n'.format(p.idlname))
  55     output.write("};\n\n")
  56
  57     # Generate kIDLNameSortPositionTable
  58     ps = sorted(properties, key=lambda p: p.idlname if p.idlname else "")
  59     ps = [(p, position) for position, p in enumerate(ps)]
  60     ps.sort(key=lambda item: item[0].index)
  61     output.write(
  62         "const int32_t nsCSSProps::"
  63         "kIDLNameSortPositionTable[eCSSProperty_COUNT] = {\n"
  64     )
  65     for p, position in ps:
  66         output.write("  {},\n".format(position))
  67     output.write("};\n\n")
  68
  69     # Generate preferences table
  70     output.write(
  71         "const nsCSSProps::PropertyPref " "nsCSSProps::kPropertyPrefTable[] = {\n"
  72     )
  73     for p in raw_properties.values():
  74         if not p.pref:
  75             continue
  76         if p.type() != "alias":
  77             prop_id = "eCSSProperty_" + p.id
  78         else:
  79             prop_id = "eCSSPropertyAlias_" + p.alias_id
  80         output.write('  {{ {}, "{}" }},\n'.format(prop_id, p.pref))
  81     output.write("  { eCSSProperty_UNKNOWN, nullptr },\n")
  82     output.write("};\n\n")
  83
  84     # Generate shorthand subprop tables
  85     names = []
  86     for p in properties:
  87         if p.type() != "shorthand":
  88             continue
  89         name = "g{}SubpropTable".format(p.method)
  90         names.append(name)
  91         output.write("static const nsCSSPropertyID {}[] = {{\n".format(name))
  92         for subprop in p.subprops:
  93             output.write("  eCSSProperty_{},\n".format(subprop))
  94         output.write("  eCSSProperty_UNKNOWN\n")
  95         output.write("};\n\n")
  96     output.write("const nsCSSPropertyID* const\n")
  97     output.write(
  98         "nsCSSProps::kSubpropertyTable["
  99         "eCSSProperty_COUNT - eCSSProperty_COUNT_no_shorthands"
 100         "] = {\n"
 101     )
 102     for name in names:
 103         output.write("  {},\n".format(name))
 104     output.write("};\n\n")
 105
 106     # Generate assertions
 107     msg = (
 108         "GenerateCSSPropsGenerated.py did not list properties "
 109         "in nsCSSPropertyID order"
 110     )
 111     for p in properties:
 112         output.write(
 113             'static_assert(eCSSProperty_{} == {}, "{}");\n'.format(p.id, p.index, msg)
 114         )